Fixed front sight as seen through a PA red dot.
If you use a magnified optic the front sight well not be noticeable past 3X or so.
Personalty I would avoid Leapers, UTG, NcStar and other extra cheap Chinese optics. Been there, done that, don't waste your money.
Primary Arms has a good line of low cost import red dots that have a warranty with great customer service. PA also has a great selection of buis sights.